Reference

Simple English Wikipedia
https://simple.wikipedia.org/wiki/Main_Page

Merriam-Webster's Learner's Dictionary
https://www.learnersdictionary.com/

Cambridge Learner's Dictionary
https://dictionary.cambridge.org/us/dictionary/learner-english/

Oxford Learner's Dictionary
http://www.oxfordlearnersdictionaries.com/us/

Merriam-Webster's Thesaurus
https://www.merriam-webster.com/thesaurus

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